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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Seating depth discovery....and question
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<blockquote data-quote="vancewalker007" data-source="post: 2196580" data-attributes="member: 66917"><p>You have somewhere around 60/1000 inch difference there. That can make a fairly massive difference in how a round will perform on Point of Impact (POI). But, you really need to measure the Cartridge Base to Ogive (CBTO) distance not Over All Length (OAL) for determining equality between rounds. The meplat on the bullet can vary a lot bullet to bullet contributing to a difference in OAL. But you do have enough difference there that the rounds will likely shoot to different POIs. I typically think of OAL as a coarse measurement to make sure a round will fit into a magazine and not really useful for performance tuning. Dropping rounds on the floor can contribute to bullet offset if you have low neck tension. Lock the dog out when you're working on ammo so you don't have a 52 pickup game <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" />.</p></blockquote><p></p>
[QUOTE="vancewalker007, post: 2196580, member: 66917"] You have somewhere around 60/1000 inch difference there. That can make a fairly massive difference in how a round will perform on Point of Impact (POI). But, you really need to measure the Cartridge Base to Ogive (CBTO) distance not Over All Length (OAL) for determining equality between rounds. The meplat on the bullet can vary a lot bullet to bullet contributing to a difference in OAL. But you do have enough difference there that the rounds will likely shoot to different POIs. I typically think of OAL as a coarse measurement to make sure a round will fit into a magazine and not really useful for performance tuning. Dropping rounds on the floor can contribute to bullet offset if you have low neck tension. Lock the dog out when you're working on ammo so you don't have a 52 pickup game ;). [/QUOTE]
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Seating depth discovery....and question
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